They don't seem to be causing an issue. On Sep 20, I killed the dnsaadmin process itself to get rid of about 20-30 of them. It recovered itself ok, but is still leaving a zombie or 2 every day ?? Is this normal/expected with the new way it works ?

cPanel version 60 is tentatively scheduled for publication to the "Current" build tier next week. In the meantime, you can temporarily disable "Dormant Mode" for the dnsadmin service via the "Dormant services" option under the "Software" tab in "WHM >> Tweak Settings".